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DATA DEFINITIONS
The following definitions are for the data found in the station.xml file.

Volume
Volume = the number of vehicles passing the detector during the 30 second sample period.

Occupancy
Occupancy = the percentage of time, during the 30 second sample period, that the detector sensed a vehicle.

Flow
Flow = the volume, normalized to an hour ( volume * 120 ).

Speed
Speed = the average speed of all vehicles passing the detector during the 30 second sample period.